为了表示强调，经常将never等否定副词或by no means等杏定词组放在句首，此时句子 要求将系动词、助动词或情态动词放在主语之前，而谓语部分位置不变，这就是部分倒装。 常用的否定副词或词组有：
never little not until in no sense under no circumstances
seldom nowhere not in the least in no way under no condition
hardly in vain by no means in no shape no sooner...than...
scarcely not often on no account in no case Hardly / Scarcely...when...
rarely not a bit at no time in no wise not only...but(also)...
Never have I seen such a terrible performance.
Not until yesterday did little John change his mind.
At no time must this door be left unlocked.
Hardly had he got out of the court when the reporters raised a lot of questions to him.
=No sooner had he got out of the court than the reporters raised a lot of questions to him
Only in this way is it possible to explain their actions.
Only after he had spoken out the word did he realize he had made a big mistake.
Only in recent years have people begun to realize that wild dogs，kept within bounds，often do more good than harm.
You speak English better than do most of your classmates.
He looked forward,as did his secretary，to the completion of the building.
Old books that have ceased to be service should no more be abandoned than should old friends who have ceased to give pleasure.
Were it all true，it would still not excuse their actions. (= If it were all true，it would still not excuse their actions.)
Were they to cease advertising，prices would be significantly reduced. (= If they were to cease advertising,prices would be significantly reduced.)
She would grieve at the changes were she alive today.
I would not have spoken ill of her had I known the truth.
Had I accepted his advice at that time，I would have succeeded now.
Should ministers decide to make an inquiry，we would welcome it. ( = If ministers should decide to make an inquiry，we would welcome it.)
Should you change your plans，please let me know.
whether(. . . or)引导让步状语从句时，如果其谓语动词是系动词be，并且采用虚拟语气， 可将be置于句首并省略whether，采用倒装表示强调。
Catching a frog can be a difficult business,be you a human or a bird or a reptile.
【注释】 =Catching a frog can be a difficult business ? vuh el her you be a human or a bird or a reptile.此处从句的谓语动词形式不是are，而是虚拟语气形式be。
Be it bird，fish or beast,porpoises are intrigued with anything that is alive.
So absurd was his manner that everyone stared at him.
So quickly did she leave that we did not even realize she was gone.
Such a selfish person is that man that he was dismissed from the company.
Such is the power of suggestion that within a very few minutes she fell asleep
John saw the accident and so did Mary.
John didn‘t see the accident and neither did Marry.
She wasn’t angry and nor was I.
"lt‘s time for you，but not for me,"replied Gary.
"Maybe we should collect our thoughts for a moment,"he commented .
The past one can know,but the future one can only feel.
What I am going to do next I don’t quite know.
How he escaped a broken leg I can’t imagine.
A horrible mess you’ve made of it.
How he managed to escape from the terrible accident I can’t imagine.
One of the copies he folded into an envelope and sent to the Commissioner
Very dishonest he seemed.(表语前置）
To such motives，yet another must be added.(状语前置）
Genius as she was,she was quite unassuming(谦逊）.（名词前置）
Selfish as he is，he is the only person we can rely on.(形容词前置）
Much as they admire her looks and her manners^they have no wish to marry her.(副词前置）
Change your mind as you will，you will gain no additional support.(动词前置）
Stupid though it sounds，I was so in love with her that I believed her.(形容词前置）